Additional HDD to be added in RAID-5

I have a ML370 server with HP 641 Raid controller. I am using 3 HDD of 36GB in RAID-5.

I want to increase the capacity by around 150GB. Can I use a single 146GB HDD as RAID-0 in addition to present RAID-5. If yes then is it required to reconfigure the RAID controller or it will automatocally take it and i just need to format it in windows..

>>I am asking this because i heard from one of my collegues that it will not accept as 146GB but as 36GB.<<
Only if you include it in the RAID-5 array (I'm not even sure if this controller supports online

LucF is correct however if you installed the PC from SmartStart you will have the HP ACU (array configuration Utility) on the server allready you can extend and reconfigure RAID arrays and volumes from within Windows.

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Yes you are right that with one HDD i would give up on fault tolerance. But i have DLT backup and we take a regular backup.
The OS is on RAID 5.

My only concern is that, as i have 3x36GB HDDs in RAID5, will it accept additional 146GB. I am not much concerned about the fault tolerence of the new HDD and I dont want to disturb my current OS installation.

I am asking this because i heard from one of my collegues that it will not accept as 146GB but as 36GB.

Will you please tell me about some links regarding HP arrays including hot swap etc.

>>I am asking this because i heard from one of my collegues that it will not accept as 146GB but as 36GB.<<
Only if you include it in the RAID-5 array (I'm not even sure if this controller supports online capacity expansion) but if you just add it as a single disk, and won't include it in the array it'll just be seen as a 146GB disk. And yes, this controller does support multiple arrays, so just add the disk in it's own array.

>>i heard from one of my collegues that it will not accept as 146GB but as 36GB.

Yes and No, If you added it to a RAID 5 array (or a stripe set with Parity if your used to NT4 speak) then ony 36Gb would be added to the array - but theres nothing to stop you usung the remainder of the drive for something else (page file and log files for example)

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